From left to right : Mr Michael Griffin, NASA Administrator and Mr Jean-Jacques Dordain, ESA Director General.

Credits: ESA - S.Corvaja

It will put two test masses in a near-perfect gravitational free-fall and control and measure their motion with unprecedented accuracy. This is achieved through state-of-the-art technology comprising the inertial sensors, the laser metrology system, the drag-free control system and an ultra-precise micro-propulsion system.

Credits: Astrium